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QKnxNetIpDisconnectRequestProxy Class

The QKnxNetIpDisconnectRequestProxy class provides the means to read a KNXnet/IP disconnection request from the generic QKnxNetIpFrame class and to create a disconnection request frame based on the information. More...

Header: #include <QKnxNetIpDisconnectRequestProxy>
qmake: QT += knx

Public Types

class Builder

Public Functions

QKnxNetIpDisconnectRequestProxy(const QKnxNetIpFrame &frame)
quint8 channelId() const
QKnxNetIpHpai controlEndpoint() const
bool isValid() const

Static Public Members

QKnxNetIpDisconnectRequestProxy::Builder builder()

Detailed Description

A KNXnet/IP client terminates a data channel connection to a KNXnet/IP server by sending a disconnection request to the server's control endpoint. The client should try to disconnect gracefully, even under error conditions.

The server may disconnect from the client by sending a disconnection request due to internal problems or reception of invalid data packets. However, it is recommended to let the client terminate the connection.

The KNXnet/IP device receiving the disconnection request acknowledges the operation with a KNXnet/IP disconnection response frame, QKnxNetIpDisconnectResponseProxy, which signals the final termination of a communication channel.

In most programs, this class will not be used directly. Instead, the QKnxNetIpTunnel or QKnxNetIpDeviceManagement class is used to establish a functional connection to a KNXnet/IP server.

Note: When using QKnxNetIpDisconnectRequestProxy, care must be taken to ensure that the referenced KNXnet/IP frame outlives the proxy on all code paths, lest the proxy ends up referencing deleted data.

The following code sample illustrates how to read the disconnection request information sent by a KNXnet/IP client:

auto netIpFrame = QKnxNetIpFrame::fromBytes(...);

const QKnxNetIpDisconnectRequestProxy proxy(netIpFrame);
if (!proxy.isValid())
    return;

quint8 chanId = proxy.channelId();
auto hpai = proxy.controlEndpoint();

See also builder().

Member Function Documentation

QKnxNetIpDisconnectRequestProxy::QKnxNetIpDisconnectRequestProxy(const QKnxNetIpFrame &frame)

Constructs a proxy object to read the disconnection request information carried by the specified KNXnet/IP frame frame.

[static] QKnxNetIpDisconnectRequestProxy::Builder QKnxNetIpDisconnectRequestProxy::builder()

Returns a builder object to create a KNXnet/IP disconnection request frame.

quint8 QKnxNetIpDisconnectRequestProxy::channelId() const

Returns the ID of the communication channel between the KNXnet/IP client and server.

QKnxNetIpHpai QKnxNetIpDisconnectRequestProxy::controlEndpoint() const

Returns the control endpoint of the KNXnet/IP device sending the disconnection request.

bool QKnxNetIpDisconnectRequestProxy::isValid() const

Returns true if the frame contains initialized values and is in itself valid, otherwise returns false. A valid KNXnet/IP frame consists of at least a valid header and a size in bytes corresponding to the total size of the KNXnet/IP frame header.

See also QKnxNetIpFrameHeader::totalSize().

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